Although Andrew had some affection for these girls, it was not yet at the level of unconditional love like the one he had for his wives. He has simply awakened affection for them and so is ready to make them his partner.
However, Andrew did not want to hide things from them as he did with Victoria at the time. He knew that his wife's seal would not immediately show in Helga and Layla, as their affection was not as strong.
Still, he did not intend to hide the secret of being a candidate for the god Eros from her. Although the situation of Helga and Layla is very similar to the situation he had with Victoria at the time, there were fundamental differences.